{
  "bibcode": "2022GCN.31416....1Z",
  "body": "Z.P. Zhu (NAOC,HUST), S.Q. Jiang, S.Y. Fu, X. Liu, D. Xu (NAOC), X. Gao \n(Urumqi No.1 Senior High School), J.Z. Liu (XAO) report:\n\nWe observed the field of GRB 220107A detected by Fermi (the Fermi/GBM \nteam, GCN Circ. 31399, Kunzweiler et al. GCN Circ. 31400) and Swift \n(DeLaunay et al. GCN Circ. 31402), using the NEXT-0.6m telescope located \nat Nanshan, Xinjiang, China. Observations started at 19:46:36 UT on \n2022-01-08 (i.e., 29.46 hrs after the Fermi GBM trigger), and 10x300 s \nframes were obtained in the Sloan r-filter.\n\nThe previously reported optical afterglow (Hosokawa et al. GCN Circ. \n31413, Siegel et al. GCN Circ. 31415) is clearly detected in our stacked \nimage, and has decayed to r = 20.22 +/- 0.05, calibrated by nearby SDSS \nstars.",
  "circularId": 31416,
  "createdOn": 1641697644000,
  "email": "dxu@nao.cas.cn",
  "subject": "GRB 220107A: Nanshan/NEXT optical observations",
  "submitter": "Dong Xu at NAOC/CAS  <dxu@nao.cas.cn>",
  "eventId": "GRB 220107A"
}